OLDER GENTLEMAN (accompanied by wife): So, Jenny, are you in school?
ME: I am, yes
OG: Then why aren’t you in class right now? It’s Friday!
ME: I don’t have class on Fridays!
OG: Where do you go to school?
ME: I’m in my last year at MSUM.
OG: You’re a senior in college? Really. I thought you were 16.
approximatelyes.com 
I get that a lot, somehow! I console myself thinking I'll be grateful for the youthful genes when I hit forty! 😛